Smith, Jonathan D.H., author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Barnes, Wilfred E., author
D. C. Hearth, 1963
Buku Teks
Whitelaw, Thomas A., author
Blackie Academic & Professional, 1995
Buku Teks SO
Ehrlich, Gertrude, author
PWS-Kentt Publishing, 1991
Buku Teks
Pinter, Charles C.
McGraw-Hill, 1982
Buku Teks